[openib-general] Re: RMPP

[Sean Hefty]

Hal Rosenstock wrote:
> Hi Sean,
> 
> I'm in the process of enabling the receive side RMPP from user space and
> this is what I'm seeing in terms of RMPP right now. I have a question
> about the OpenSM side.
> 
> SA client OpenSM
> SA GetTable (PortInfoRecord) -->
>                              <--  SA GetTableResp (PortInfoRecord)
> RMPP active, first
> payload length 0x44C
> 
> retries is set to 4 so I see 4 responses (at 2 sec intervals) as the
> client is not currently ACKing. All is fine up to that point.
> 
> At that point, OpenSM sees a large receive which appears to be that send
> timing out (nothing was sent nor observed on the IB wire).
> 
> Could a timed out RMPP send end up as a receive somehow ?

On the side that sent the MAD?  That should be no.

On the remote side, a send can timeout, but still be received, since the ACK 
is unreliable.  But I don't think that this is the situation that you're 
describing.

- Sean